Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd87797ff2d9995…

MALICIOUS

PDF

91.1 KB Created: 2021-08-31 23:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9815a2d9e3d6e08bd05556c3a59c03cb SHA-1: 3ebce3bb7fbe83aa5edc8b2a7b913908118be95d SHA-256: 1cd87797ff2d9995a1ef5ee88bd1bc58d05bd92936ebde269167df212380fdfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=product+law+of+logarithms PDF link annotation
    • http://cohensevents.com/clients/74638/File/3488983380.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/dilositakijujopasokovil.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xalagepalabudozi.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108130945574593.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/wonidukod.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc19805312a---xowaserazosowivaluluvon.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/39761924751.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/20121816843.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kipimibusubonu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/jezak.pdfIn PDF document text
    • http://wjcopy.com/upload/files/13638680954.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d91eaa9c---jorog.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607796359e46b---pitadozixejalalipoxugi.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/rusabaxolereb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20b6f33ec5---numuvuwamazozodadovil.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/forosudakomamemowag.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/67016351936.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/28492985690.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8p8d26m4l4cbcvtibsquedfkat/11542672873.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/fujegowemijisojalile.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jadokupikagenajabidu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071202a55e7f---391654424.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v7dsc3r6dqspk9bifr10vh0neb/3366042557.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nawomoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 20884 bytes
SHA-256: 0759461b0c6f1645814d127822de560d9e3d09ace5f8d0f040f61d1508442a5b
font_01_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 10876 bytes
SHA-256: 0aab5b559644798452f14cfe33ad5224ec30a0a615515a64c1577e616442e642
font_02_sfnt_off000144bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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